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eb13296c MH |
1 | #ifndef _ASM_X86_INSN_H |
2 | #define _ASM_X86_INSN_H | |
3 | /* | |
4 | * x86 instruction analysis | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | * Copyright (C) IBM Corporation, 2009 | |
21 | */ | |
22 | ||
23 | /* insn_attr_t is defined in inat.h */ | |
24 | #include <asm/inat.h> | |
25 | ||
26 | struct insn_field { | |
27 | union { | |
28 | insn_value_t value; | |
29 | insn_byte_t bytes[4]; | |
30 | }; | |
31 | /* !0 if we've run insn_get_xxx() for this field */ | |
32 | unsigned char got; | |
33 | unsigned char nbytes; | |
34 | }; | |
35 | ||
36 | struct insn { | |
37 | struct insn_field prefixes; /* | |
38 | * Prefixes | |
39 | * prefixes.bytes[3]: last prefix | |
40 | */ | |
41 | struct insn_field rex_prefix; /* REX prefix */ | |
e0e492e9 | 42 | struct insn_field vex_prefix; /* VEX prefix */ |
eb13296c MH |
43 | struct insn_field opcode; /* |
44 | * opcode.bytes[0]: opcode1 | |
45 | * opcode.bytes[1]: opcode2 | |
46 | * opcode.bytes[2]: opcode3 | |
47 | */ | |
48 | struct insn_field modrm; | |
49 | struct insn_field sib; | |
50 | struct insn_field displacement; | |
51 | union { | |
52 | struct insn_field immediate; | |
53 | struct insn_field moffset1; /* for 64bit MOV */ | |
54 | struct insn_field immediate1; /* for 64bit imm or off16/32 */ | |
55 | }; | |
56 | union { | |
57 | struct insn_field moffset2; /* for 64bit MOV */ | |
58 | struct insn_field immediate2; /* for 64bit imm or seg16 */ | |
59 | }; | |
60 | ||
61 | insn_attr_t attr; | |
62 | unsigned char opnd_bytes; | |
63 | unsigned char addr_bytes; | |
64 | unsigned char length; | |
65 | unsigned char x86_64; | |
66 | ||
67 | const insn_byte_t *kaddr; /* kernel address of insn to analyze */ | |
6ba48ff4 | 68 | const insn_byte_t *end_kaddr; /* kernel address of last insn in buffer */ |
eb13296c MH |
69 | const insn_byte_t *next_byte; |
70 | }; | |
71 | ||
91e5ed49 | 72 | #define MAX_INSN_SIZE 15 |
30a813ae | 73 | |
eb13296c MH |
74 | #define X86_MODRM_MOD(modrm) (((modrm) & 0xc0) >> 6) |
75 | #define X86_MODRM_REG(modrm) (((modrm) & 0x38) >> 3) | |
76 | #define X86_MODRM_RM(modrm) ((modrm) & 0x07) | |
77 | ||
78 | #define X86_SIB_SCALE(sib) (((sib) & 0xc0) >> 6) | |
79 | #define X86_SIB_INDEX(sib) (((sib) & 0x38) >> 3) | |
80 | #define X86_SIB_BASE(sib) ((sib) & 0x07) | |
81 | ||
82 | #define X86_REX_W(rex) ((rex) & 8) | |
83 | #define X86_REX_R(rex) ((rex) & 4) | |
84 | #define X86_REX_X(rex) ((rex) & 2) | |
85 | #define X86_REX_B(rex) ((rex) & 1) | |
86 | ||
e0e492e9 MH |
87 | /* VEX bit flags */ |
88 | #define X86_VEX_W(vex) ((vex) & 0x80) /* VEX3 Byte2 */ | |
89 | #define X86_VEX_R(vex) ((vex) & 0x80) /* VEX2/3 Byte1 */ | |
90 | #define X86_VEX_X(vex) ((vex) & 0x40) /* VEX3 Byte1 */ | |
91 | #define X86_VEX_B(vex) ((vex) & 0x20) /* VEX3 Byte1 */ | |
92 | #define X86_VEX_L(vex) ((vex) & 0x04) /* VEX3 Byte2, VEX2 Byte1 */ | |
93 | /* VEX bit fields */ | |
94 | #define X86_VEX3_M(vex) ((vex) & 0x1f) /* VEX3 Byte1 */ | |
95 | #define X86_VEX2_M 1 /* VEX2.M always 1 */ | |
96 | #define X86_VEX_V(vex) (((vex) & 0x78) >> 3) /* VEX3 Byte2, VEX2 Byte1 */ | |
97 | #define X86_VEX_P(vex) ((vex) & 0x03) /* VEX3 Byte2, VEX2 Byte1 */ | |
98 | #define X86_VEX_M_MAX 0x1f /* VEX3.M Maximum value */ | |
99 | ||
6ba48ff4 | 100 | extern void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64); |
eb13296c MH |
101 | extern void insn_get_prefixes(struct insn *insn); |
102 | extern void insn_get_opcode(struct insn *insn); | |
103 | extern void insn_get_modrm(struct insn *insn); | |
104 | extern void insn_get_sib(struct insn *insn); | |
105 | extern void insn_get_displacement(struct insn *insn); | |
106 | extern void insn_get_immediate(struct insn *insn); | |
107 | extern void insn_get_length(struct insn *insn); | |
108 | ||
109 | /* Attribute will be determined after getting ModRM (for opcode groups) */ | |
110 | static inline void insn_get_attribute(struct insn *insn) | |
111 | { | |
112 | insn_get_modrm(insn); | |
113 | } | |
114 | ||
115 | /* Instruction uses RIP-relative addressing */ | |
116 | extern int insn_rip_relative(struct insn *insn); | |
117 | ||
118 | /* Init insn for kernel text */ | |
6ba48ff4 DH |
119 | static inline void kernel_insn_init(struct insn *insn, |
120 | const void *kaddr, int buf_len) | |
eb13296c MH |
121 | { |
122 | #ifdef CONFIG_X86_64 | |
6ba48ff4 | 123 | insn_init(insn, kaddr, buf_len, 1); |
eb13296c | 124 | #else /* CONFIG_X86_32 */ |
6ba48ff4 | 125 | insn_init(insn, kaddr, buf_len, 0); |
eb13296c MH |
126 | #endif |
127 | } | |
128 | ||
e0e492e9 MH |
129 | static inline int insn_is_avx(struct insn *insn) |
130 | { | |
131 | if (!insn->prefixes.got) | |
132 | insn_get_prefixes(insn); | |
133 | return (insn->vex_prefix.value != 0); | |
134 | } | |
135 | ||
1ec454ba MH |
136 | /* Ensure this instruction is decoded completely */ |
137 | static inline int insn_complete(struct insn *insn) | |
138 | { | |
139 | return insn->opcode.got && insn->modrm.got && insn->sib.got && | |
140 | insn->displacement.got && insn->immediate.got; | |
141 | } | |
142 | ||
e0e492e9 MH |
143 | static inline insn_byte_t insn_vex_m_bits(struct insn *insn) |
144 | { | |
145 | if (insn->vex_prefix.nbytes == 2) /* 2 bytes VEX */ | |
146 | return X86_VEX2_M; | |
147 | else | |
148 | return X86_VEX3_M(insn->vex_prefix.bytes[1]); | |
149 | } | |
150 | ||
151 | static inline insn_byte_t insn_vex_p_bits(struct insn *insn) | |
152 | { | |
153 | if (insn->vex_prefix.nbytes == 2) /* 2 bytes VEX */ | |
154 | return X86_VEX_P(insn->vex_prefix.bytes[1]); | |
155 | else | |
156 | return X86_VEX_P(insn->vex_prefix.bytes[2]); | |
157 | } | |
158 | ||
f8d98f10 MH |
159 | /* Get the last prefix id from last prefix or VEX prefix */ |
160 | static inline int insn_last_prefix_id(struct insn *insn) | |
161 | { | |
162 | if (insn_is_avx(insn)) | |
163 | return insn_vex_p_bits(insn); /* VEX_p is a SIMD prefix id */ | |
164 | ||
165 | if (insn->prefixes.bytes[3]) | |
166 | return inat_get_last_prefix_id(insn->prefixes.bytes[3]); | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
eb13296c MH |
171 | /* Offset of each field from kaddr */ |
172 | static inline int insn_offset_rex_prefix(struct insn *insn) | |
173 | { | |
174 | return insn->prefixes.nbytes; | |
175 | } | |
e0e492e9 | 176 | static inline int insn_offset_vex_prefix(struct insn *insn) |
eb13296c MH |
177 | { |
178 | return insn_offset_rex_prefix(insn) + insn->rex_prefix.nbytes; | |
179 | } | |
e0e492e9 MH |
180 | static inline int insn_offset_opcode(struct insn *insn) |
181 | { | |
182 | return insn_offset_vex_prefix(insn) + insn->vex_prefix.nbytes; | |
183 | } | |
eb13296c MH |
184 | static inline int insn_offset_modrm(struct insn *insn) |
185 | { | |
186 | return insn_offset_opcode(insn) + insn->opcode.nbytes; | |
187 | } | |
188 | static inline int insn_offset_sib(struct insn *insn) | |
189 | { | |
190 | return insn_offset_modrm(insn) + insn->modrm.nbytes; | |
191 | } | |
192 | static inline int insn_offset_displacement(struct insn *insn) | |
193 | { | |
194 | return insn_offset_sib(insn) + insn->sib.nbytes; | |
195 | } | |
196 | static inline int insn_offset_immediate(struct insn *insn) | |
197 | { | |
198 | return insn_offset_displacement(insn) + insn->displacement.nbytes; | |
199 | } | |
200 | ||
201 | #endif /* _ASM_X86_INSN_H */ |